I hear you. I’ve been on iPhones since the 4 and always typed with autocorrect turned off. When swipe-to-type finally came out I was stoked, but it constantly screws things up. “To” instead of “too” or vice-versa, it’s never the one I actually want (and “of” vs “off” as well, they need to work on these types of pairs), “s” instead of “a”, “o” instead of “I”, apostrophes for words I’m trying to pluralize. And while I can’t verify, my theory is that words with negative connotations are downweighted. I mean good luck ever getting an actual curse word out of it, but I’ve also noticed it with plenty of other words.

ETA: selecting misspelled words to choose replacement seems completely broken to me. 99% of the time I can’t even tap it to select even though it’s underlined in red.